Richard Denning

Dr. Chet Walker

S. John Launer

Capt. Dave Harris

Michael Granger

Frank Buchanan

Gregory Gaye

Dr. Wilhelm Steigg

Angela Stevens

Joyce Walker

Charles Evans

Chief Camden

Tristram Coffin

Dist. Atty. MacGraw

Pierre Watkin

Mayor Bremer

Harry Lauter

Reporter #1

Larry J. Blake

Reporter #2

Nelson Leigh

Dr. Kenneth C. Norton (uncredited)

Lane Chandler

Gen. Saunders (uncredited)

Don C. Harvey

Lester Banning (uncredited)

Richard H. Cutting

Dick Cutting, Radio Broadcaster (uncredited)

Karl 'Killer' Davis

Willard Pearce (uncredited)

Terry Frost

Tom, Policeman (uncredited)

Cap Somers

Policeman (uncredited)

Tyler McVey

Police Officer (uncredited)

Chuck Hicks

Pilot (uncredited)

Boyd 'Red' Morgan

Creature (uncredited)

Michael Ross

Creature Vernon Dunn (uncredited)